. >> and to ionstein einstein was right, he predicted the existence of gravitational waves a part of his theory of relativity, and he claimed that the waves were created by violent clietions collisions in collisions inthe universe, and it was just a theory, and they never thought they would be able to prove it, but using some special instruments, scientists been able to predict the police station collision oftwo black holes. >> that is pretty impressive, and look, some fascinating video, that all of you have been raving about, a very rare manatee moment. above the water, pokes his head out and he is enjoying a little snack of spanish moss. can you believe that? >> that is really cool. and fox 13's josh cascio has a look at why the area is one of the manatee's favorite for spots this time of year. >> pictures and videoing coming out of three sisters springs are going viral. >> like this one of a huge gathering of manatees. they are flocking to three str's sister's springs to stay home as the temperatures drop, sometimes up to 300 of them, from as far away as texas and louisiana and th

. >>> coming up next, ionstein predicted it a -- einstein predicted it and now m.i.t. found the holy grail of out of space. this. are you missing on great deals because you are not asking for them? getting in on a shopping secret coming up. >> and don't look down. the new video we have tonight from fenway's big air. >>> so the next story we have to stay up front may make your brain hurt a little bit. it did to me. supercool and super nerdy and incredibly important. >> i got the text and he he think i looked at it 2 or 3 times and wait. m.i.t. discovered what it is call the holy grail of physics and as bree sisson tells us it's something einstein predicted a hundred years ago. >> reporter: einstein was right something nearly impossible to detect does indeed exist. listen closely. did you hear it? try again. that short sound is the echo of two massive black holes colliding 1.3 billion light- the discovery ushers in a new era in astronomy. >> imagine that you only ever been to a silent movie and then suddenly you go to a talking movie. >> reporter: one of a thousand scien